Ukraine's Prosecutor General Yuri Lutsenko said Yanukovych's confession was needed to indict him, as Ukraine does not have the original of the ill-famed letter.

"Why this case was not possible before? Because Victor Fedorovych, having an outstanding idiocy talent, stated himself at the press conference that he had signed that letter,"Lutsenko said to 112 UkraineTV channel.

"Now we are conducting expert examinations to document that it was him appearing on TV, his voice, and that was exactly what he'd said. The three expert reports are to be ready within a very short time. After that, the indictment will be laid down,"added the Prosecutor General.

"The country has plunged into chaos and anarchy,"Russian Ambassador Vitaly Churkin read from an unofficial translation of the letter "The country is in the grip of outright terror and violence driven by the West."

"People are persecuted on political and language grounds,"he read. "In this context, I appeal to the President of Russia Vladimir V. Putin to use the armed forces of the Russian Federation to re-establish the rule of law, peace, order, stability and to protect the people of Ukraine."

Commenting on the request on November 25, Yanukovych said he was driven by emotions at that time.

"This document [a letter addressing Putin] indeed existed. There was an emotional decision to somehow influence the offensive of illegal armed formations, [to stop] violence in Donbas,"Yanukovych said at a press conference in Rostov-on-Don, Russia, on Friday, answering a question from an UNIAN correspondent.